You're linking a minimal manual which is required for corporate deployment, hardly anything Apple is being forthcoming about. I'm pretty sure you and I have different definitions of acceptable disclosure - unless Apple makes the entire chip possible to audit, I don't consider it to be acceptable.
A completely transparent audit like you're suggesting would compromise the majority of the security features of the enclave. The white paper gives enough about the mechanism to understand how it works without detailing specifics that would compromise the security of tech.